For most people in their twenties, life is a constant balancing act of paying off student debt and finding the funds to be independent while still having fun.

That’s not the case for Kylie Jenner and other members of the world’s super-young, super-rich elite. Kylie Jenner sold a majority stake in her makeup brand to CoverGirl parent company Coty Inc. for $600 million Monday, Business Insider’s Dominic-Madori Davis previously reported. The deal, expected to close in 2020, values Kylie Cosmetics at $1.2 billion.

We took a look at the lives of the world’s five youngest billionaires — all 28 years old and under — to see how they spend their days and their seemingly unlimited funds.

From zooming Ferraris to international dressage competitions, scroll down to meet the world’s five youngest billionaires, presented by age in ascending order, and see how they spend their fortunes.

This is how the world’s 5 youngest billionaires spend their time and money slides

This is how the world’s 5 youngest billionaires spend their time and money slides

Just behind the Andresen sisters is Gustav Magnar Witzøe, who is also among Norway's super-rich and is the fourth-youngest billionaire in the world.

This 26-year-old is worth $3 billion and owns 47% of Norwegian salmon producer Salmar, which was gifted to him in 2013 by his dad Gustav Witzoe, pictured here. He's the wealthiest billionaire on this list.

Like the Andresen sisters, Witzøe also has a pet dog: His blue Staffordshire bull terrier features heavily on his Instagram.

John Collison is the fifth-youngest billionaire and the second-youngest self-made billionaire in the world.

The 29-year-old Irish entrepreneur founded payment company Stripe with his brother in 2010, which went on to make the pair both billionaires in their own right after a deal in 2016. John is now worth an estimated $2.1 billion.

Collison was studying his undergraduate degree at Harvard when he and his brother launched the company, but he quickly dropped out after Stripe gained momentum. Now, his days are spent pursuing hobbies and things on his bucket list, like flying across the Atlantic.